<p><a href="http://foo.com/blah_blah_blah/123">Blah 123</a> becomes a line with two underscores.</p>

<p><a href="http://localhost/#42">http://localhost/#42</a> with another reference to Issue <a href="http://localhost/issue/42">#42</a> in the same line</p>

<p><a href="http://localhost">Issue #42</a></p>
